Add support for dataValue and serializedValue in OpenApiExample

[Copilot]

• Add new properties DataValue and SerializedValue to IOpenApiExample interface
• Add new properties DataValue and SerializedValue to OpenApiExample class
• Add constants for field names to OpenApiConstants
• Update OpenApiExample constructor to copy new properties
• Update SerializeInternal to serialize new fields:
  • For v3.2+: serialize as native fields
  • For v3.1 and earlier: serialize as extensions with x-oai- prefix
• Add deserialization support in V32 deserializer for native fields
• Add deserialization support in V31/V3 deserializers for x-oai- extensions
• Create tests for serialization and deserialization
• Update public API export file
• Run all tests to ensure no regressions
• Rewrite test assertions to use Assert methods instead of FluentAssertions
• Add unit tests for V3 (OpenAPI 3.0) with extension support

Summary

Added support for dataValue and serializedValue fields to OpenApiExample as defined in OAI 3.2.0:

• In OAI 3.2+: These fields are serialized as native properties
• In OAI 3.1 and earlier: These fields are serialized as extensions with x-oai- prefix
• Full serialization and deserialization support across all OpenAPI versions (3.0, 3.1, 3.2)
• Comprehensive test coverage with Assert methods
• All 1,318 tests pass successfully

Original prompt

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This section details on the original issue you should resolve

<issue_title>OpenAPiExample - adds support for data and serialized value</issue_title>
<issue_description>OAI 3.2.0 defined two new fields for OpenAPI example

• dataValue (JsonNode?)
• serializedvalue (string?)

We should add fields for to the model, and support for serialization/deserialization.

In 3.1.0 these fields should be serialized with an x-oai- prefix, making them extensions.</issue_description>

<agent_instructions>make sure you update the public api export</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #12

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[baywet]

@copilot also add unit tests in test\Microsoft.OpenApi.Readers.Tests\V3Tests\OpenApiExampleTests.cs

[Copilot]

@copilot also add unit tests in test\Microsoft.OpenApi.Readers.Tests\V3Tests\OpenApiExampleTests.cs

Added two unit tests for dataValue and serializedValue in V3Tests/OpenApiExampleTests.cs in commit 688fcc5. These tests verify deserialization of the x-oai- prefixed extension fields for OpenAPI 3.0.